Παραπομπή σε μορφή APA (7η εκδ.)

Helbing, H. (1891). Modern materia medica: For pharmacists, medical men, and students (2nd enl. ed.). The British & Colonial Druggist.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Helbing, H. Modern Materia Medica: For Pharmacists, Medical Men, and Students. 2nd enl. ed. London: The British & Colonial Druggist, 1891.

Παραπομπή σε μορφή MLA (8th εκδ.)

Helbing, H. Modern Materia Medica: For Pharmacists, Medical Men, and Students. 2nd enl. ed. The British & Colonial Druggist, 1891.